题目内容

%f of scanf function, used to enter single precision real number in decimal form.

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Empty type is not a data type of C language.

All variables used in C must have their data type specified.

#includemain() { char c1,c2; c1='A'+'8'-'4'; c2='A'+'8'-'5'; printf("%c,%d\n",c1,c2); } It is known that the ASCII code of letter 'A' is 65, and the output result of this program is ( )

A. E,68
B. D,69
C. E,D
D. Output has no fixed value

#includemain() { int s,t,A=10; double B=6; s=sizeof(A); t=sizeof(B); printf(“&d,&d\n”,s,t); } Compile and run on VC++6.0 platform, the output of the program is ( )

A. 2，4
B. 4，4
C. 4，8
D. 10，6